NOTE: Depending on the supplier/strength selected, the products shipped may have different packaging.

Why is Calan SR prescribed?

Calan SR (Verapamil) is commonly prescribed to treat the following conditions: high blood pressure (hypertension), angina (a type of chest pain), paroxysmal supraventricular tachycardia (a condition causing abnormally fast heartbeats), and to help maintain a normal heart rhythm in individuals with atrial fibrillation or atrial flutter.

What does it do?

Calan SR works by relaxing your blood vessels and slowing your heart rate. This relaxation of the blood vessels allows blood to flow more easily, which helps lower blood pressure. As a result, your heart doesn’t need to work as hard, reducing the risk of chest pain. Additionally, by slowing the heart rate, Calan SR helps maintain a normal heart rhythm.

How should I take it?

Take Calan SR by mouth as directed on your prescription label, ideally at the same time each day. It should be taken with food. If the tablet is scored (has a line down the middle), you can cut it in half to make swallowing easier if the full tablet is too large. Be sure to take both halves. Do not take only one half of the tablet. Continue taking the medication unless your doctor instructs you to stop.

What if I missed a dose?

If you miss a dose, take it as soon as you remember. If it's almost time for your next dose, skip the missed dose and take only the scheduled one. Do not take two doses at once.

What are the special precautions before taking Calan SR?

Inform your doctor about all the medications you are taking, your current and previous medical history. You should not use Calan SR if you are allergic to it or if you have a serious heart condition, such as:

• Certain heart rhythm disorders of the atrium (the upper chambers of the heart)
• Severe heart failure
• Slow heartbeats that have caused you to faint
• Sick sinus syndrome or AV block (unless you have a pacemaker)

If you take Disopyramide, avoid taking it within 48 hours before or 24 hours after taking Calan SR and it also may affect your thinking and reactions, so be cautious if you drive or do anything requiring alertness.

Grapefruit and grapefruit juice may interact with Calan SR, potentially causing harmful effects. Talk to your doctor about using grapefruit products.
Does it have any side effects?
It is important to note that all drugs have corresponding side effects and adverse reactions. Additional information may be obtained when you ask your doctor or pharmacist.
Common side effects may include:
• Dizziness
• Constipation
• Headache
• Nausea
Serious side effects may include:
• Allergic reactions
• Dizziness
• Heart failure: shortness of breath, sudden weight gain, unusual weakness, swelling in the feet, ankles, or hands, or fatigue
• Liver injury
• Low blood pressure: feeling faint or lightheaded, dizziness, blurry vision
• Slow heartbeat: dizziness, feeling faint or lightheaded, unusual weakness, fatigue, or difficulty breathing
This list may not include all potential side effects. Contact your doctor for medical advice about any side effects that you may experience.
Is it safe to take it with another drug?

Some drug interactions may cause serious or life-threatening reactions when administered together. Immediately inform your doctor if you are taking Calan SR with any of the following medications:

Do not take this medication with any of the following:

• Cisapride
• Disopyramide
• Dofetilide
• Grapefruit juice
• Hawthorn
• Pimozide
This medication may also interact with:
• Cimetidine
• Cyclosporine
• Lithium
• Barbiturates, such as phenobarbital
• Theophylline or Aminophylline
• Rifampin, Rifabutin, or Rifapentine
• Local or general anesthetics
• Medications for heart rhythm problems, like Flecainide, Amiodarone, Procainamide, Digoxin, and Quinidine
• Medications for high blood pressure or heart issues
• Seizure medications, such as Carbamazepine and Phenytoin
This list may not include all possible interactions. Be sure to provide your doctor with a complete list of all medications you take.
How should I store it?
Store the medication at room temperature, between 20 and 25 degrees Celsius (68 and 77 °F). Keep it protected from light and moisture, and ensure the container is tightly closed.
What action should I take in case of overdose?
If you suspect an overdose, immediately call an ambulance and seek medical attention to prevent further complications.
Is it safe for pregnant or breastfeeding women?

Pregnancy: It is unclear how verapamil may affect pregnancy or harm an unborn baby. Inform your healthcare provider if you are pregnant or planning to become pregnant so they can evaluate the risks and benefits before you take this medication.

Breastfeeding: Verapamil is passed into breast milk. Let your healthcare provider know if you are breastfeeding or plan to breastfeed. They will guide you on whether to continue breastfeeding or discontinue the medication.

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